Linda
 
I would say that it is an infinitive phrase acting as  an adverb of reason, 
answering why the experiment was conducted.  
 
Alison Cochrane
Queensborough Community College
New York, NY
 
"I may not have gone where I intended to go, but I think I  have ended up 
where I needed to be. " 
~ Kahlil Douglas  Adams



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